owen smith
Jeremy Corbyn has also welcomed back leadership rival Owen Smith.
Now stands at 550,000 - four times the Tory membership.
Here's a history refresher.
Corbyn rebels among 114 who refused to back quitting EU.
The Pontypridd MP has had police at his surgery.
But key positions remain unfilled as reshuffle enters ninth day
Some 53% of Labour supporters say he should get a second chance
Defiant, confident, socialist. But will it work in marginal seats?
The Labour MP spoke frankly about life after quitting the Shadow Cabinet